CVE-2023-35075

HTML injection via channel autocomplete

Published Nov 27, 2023 CVSS 3.1 · 3.1 Low EPSS < 1% KEV · Not listed
Description
Mattermost fails to use  innerText / textContent when setting the channel name in the webapp during autocomplete, allowing an attacker to inject HTML to a victim's page by create a channel name that is valid HTML. No XSS is possible though. 

Remediation

Vendor Solution

Update Mattermost Server to versions 7.8.13, 8.1.4 or higher.

Tracking

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Advisories

Source ID Title
EUVD EUVD EUVD-2023-2986 Mattermost fails to use  innerText / textContent when setting the channel name in the webapp during autocomplete, allowing an attacker to inject HTML to a victim's page by create a channel name that is valid HTML. No XSS is possible though. 
Github GHSA Github GHSA GHSA-jcgv-3pfq-j4hr Mattermost Injection vulnerability
References
History
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
Mattermost
Published
Updated
Jun 3, 2025, 2:01 PM
Reserved
Nov 20, 2023, 12:06 PM
Status
Modified
Published
Nov 27, 2023, 10:15 AM
Modified
Jun 17, 2026, 6:04 AM